//
//  JaneCycleView.m
//  CycleScrollViewDemo_4
//
//  Created by lanou3g on 16/4/19.
//  Copyright © 2016年 张静. All rights reserved.
//

#import "JaneCycleView.h"

@interface JaneCycleView()<UIScrollViewDelegate>
@property (nonatomic,strong) UIScrollView *imgScrollView;
@property (nonatomic,strong) UIPageControl *imgPageControl;
//ImageView
@property (nonatomic,strong) NSMutableArray *imgViewArray;
//存放图片的数组
@property (nonatomic,strong) NSMutableArray *imgArray;
//当前展示图片的下标
@property (nonatomic,assign)NSInteger index;
//
@property (nonatomic,strong) NSTimer *imgTimer;
//点击回调block
@property (nonatomic,copy) void(^tapBlock)(NSInteger index);
@property (nonatomic,assign) NSTimeInterval interval;
@end
@implementation JaneCycleView
//初始化方法
- (instancetype)initWithFrame:(CGRect)frame interVal:(NSTimeInterval)interval {
    self = [super initWithFrame:frame];
    if (self) {
        self.imgViewArray = [NSMutableArray new];
        self.imgArray = [NSMutableArray new];
        self.imgScrollView = [[UIScrollView alloc]initWithFrame:self.bounds];
        self.imgScrollView.contentSize = CGSizeMake(frame.size.width * 3, frame.size.height);
        [self addSubview:self.imgScrollView];
        for (int i = 0; i < 3; i++) {
            UIImageView *imgView = [[UIImageView alloc]initWithFrame:CGRectMake(frame.size.width * i, 0, frame.size.width, frame.size.height)];
//            添加到父视图.数组
            [self.imgScrollView addSubview:imgView];
            [self.imgViewArray addObject:imgView];
        }
        self.imgScrollView.pagingEnabled = YES;
        self.imgScrollView.showsHorizontalScrollIndicator = NO;
        self.imgScrollView.delegate = self;
        self.interval = interval;
    }
    return self;
}
//图片滚动的方法
- (void)timerAction {
    [self.imgScrollView setContentOffset:CGPointMake(self.imgScrollView.frame.size.width * 2, 0) animated:YES];
    self.index = (self.index + 1) % self.imgNameArray.count;
    [self layoutImages];
}
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
    //    回位
    [self.imgScrollView setContentOffset:CGPointMake(scrollView.frame.size.width, 0) animated:NO];
    [self layoutImages];
}

//ImgNameArray 的 setter方法
- (void)setImgNameArray:(NSMutableArray *)imgNameArray {
    if (_imgNameArray != imgNameArray) {
        _imgNameArray = imgNameArray;
//        设置pageControl
        [self.imgPageControl removeFromSuperview];
        self.imgPageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(0, self.frame.size.height - 40, self.frame.size.width, 40)];
        [self addSubview:self.imgPageControl];
        self.imgPageControl.currentPage = 0;
        self.imgPageControl.numberOfPages = _imgNameArray.count;
        self.imgPageControl.enabled = NO;
        for (int i = 0; i < _imgNameArray.count; i++) {
            UIImage *image = [UIImage imageNamed:_imgNameArray[i]];
            [self.imgArray addObject:image];
            if (i < 3) {
                [self.imgViewArray[i] setImage:image];
            }
        }
//        设置当前偏移量
        [self.imgScrollView setContentOffset:CGPointMake(self.frame.size.width, 0)animated:NO];
        self.index = 0;
        [self layoutImages];
//        点击手势
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapCycleViewAction:)];
        [(UIImageView *)self.imgViewArray [1] addGestureRecognizer:tap];
        [(UIImageView *)self.imgViewArray [1] setUserInteractionEnabled:YES];
        //            初始化timer
        if (self.interval <= 0) {
            self.imgTimer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(timerAction) userInfo:nil repeats:YES];
        }else {
            self.imgTimer = [NSTimer scheduledTimerWithTimeInterval:self.interval target:self selector:@selector(timerAction) userInfo:nil repeats:YES];
        }
    }
}
//手势事件
- (void)tapCycleViewAction:(UITapGestureRecognizer *)tap {
    if (self.tapBlock) {
        self.tapBlock(self.index);
    }
}
#pragma mark------UIScrollViewDelegate
//   开始拖动
static CGFloat x = 0;
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    x = scrollView.contentOffset.x;
    [self.imgTimer setFireDate:[NSDate distantFuture]];
}
//   减速动画结束
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    if (x >scrollView.contentOffset.x) {
        [self panToLeft:NO Index:self.index];
    }else if (x < scrollView.contentOffset.x) {
        [self panToLeft:YES Index:self.index];
    }
    [self.imgTimer setFireDate:[NSDate dateWithTimeIntervalSinceNow:2]];
}

#pragma mark-----向右滑动,向右滑动结束切换
- (void)panToLeft:(BOOL)left Index:(NSInteger)index {
    if (!left) {
        self.index = (index - 1 + self.imgNameArray.count) % self.imgNameArray.count;

    }else {
        self.index = (index + 1) % self.imgNameArray.count;

    }
//    切换图片
    [self layoutImages];
//    回位操作
     [self.imgScrollView setContentOffset:CGPointMake(self.frame.size.width, 0) animated:NO];
}
- (void)layoutImages {
    for (int i = 0; i < 3; i++) {
        [self.imgViewArray[i] setImage:self.imgArray[(self.index - 1 + i +self.imgNameArray.count) % self.imgNameArray.count]];
    }
}
//index的setter方法
- (void)setIndex:(NSInteger)index {
    if (_index != index) {
        _index = index;
        self.imgPageControl.currentPage = index;
    }
}
//添加Block回调
- (void)addTapBlock:(void(^)(NSInteger index))block {
    self.tapBlock = block;
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

@end
